respitory systym and circulatory system because you need your lungs to breathe and the blood and heart to pump the oxygen into the blood. :))
The answer is called the Medulla oblongata. Please help me now as saying this is the brainiest answer, thanks.
Answer:
Cell theory refers to the idea that cells are the basic unit of structure in every living thing. Development of this theory during the mid 17th century was made possible by advances in microscopy. This theory is one of the foundations of biology.
The number of ions in a cell
The third option "Rhyolitic" would be your answer.
